I still haven't resolved my running problems yet, so can't provide any info on this yet, but speaking about speed limits, I was talking to my fiancee in Germany last night, and she was travelling from Hamburg to Hanover. As a passing comment, I said "Have a safe trip and don't drive too fast" - to which she replied "Don't worry, I have the winter tyres on, so I can only go 210 with those on" ! And believe me, she does in her Audi A6 diesel.
As for other cars, the fastest I have driven was 260 km/h on the Hume Highway out of Melbourne in my Saab 900 Aero turbo, which I bought new in 1985 or so. That was one quick car.